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Like others have already mentioned, you need to have the mirror adjustment switch to the driver side to active courtesy dimming passenger side mirror when in reverse, but that is only if you have electric folding mirror, at the very least for the Scandinavian variant.
I have Norwegian spec without the electronic folding mirrors, I wondered the same thing a few months ago and confirmed by BMW dealership that courtesy dimming is available only with electronic folding mirrors.
To my understanding this is software configuration rather than lack of hardware.
Hope that helps.
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